No difference in meaning, however I think “ma foi” is less broadly used. I tend to think that it’s because literally, it refers to the speaker’s religion, which areligious people don’t have much use for, and which some religious people find distasteful; but can offer no source to vouch for this other than my own personal experience.

Ma foi also seems to be used exclusively by older people, 60+. I’ve never heard a teen say it, or even anyone middle aged.

It doesn’t really help but you can also say both at once like:

“Eh bien ma foi, ce fut une bonne journée.”

Nevertheless that’s more formal speech.